two things:
1) you're romanticizing history. you're implying that every one Black was down with the struggle but that's simple not true. the main difference between today and yesteryear is that we have more reactionary negroes, financed and supported by racist whites, that actively work as agents of white supremacy.

2) COINTELPRO. let's not forget the J. Edgar Hoover made it explicitly clear that the FBI must work to prevent the rise of a Black messiah. hence, the state assassinations of Malcolm X, MLK, Fred Hampton, etc. as well as the concerted effort to get Huey Newton addicted to drugs by putting it in his food while he was in prison. and not to mention how the CIA and state department have manipulated and disrupted Black governments around the world from the Congo, to Haiti, to Jamaica, to Panama, to Guyana, to Grenada. and the list goes on.

these are two aspects of ways in which the state has worked to obstruct Black solidarity. with knowledge we can't just hang heads low and say "let's give up." imagine where we'd be.

peace.